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首页> 外文期刊>Cellular immunology >RAGE binds C1q and enhances C1q-mediated phagocytosis
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RAGE binds C1q and enhances C1q-mediated phagocytosis

机译:RAGE结合C1q并增强C1q介导的吞噬作用

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摘要

RAGE, the multiligand receptor of the immunoglobulin superfamily of cell surface molecules, is implicated in innate and adaptive immunity. Complement component C1q serves roles in complement activation and antibody-independent opsonization. Using soluble forms of RAGE (sRAGE) and RAGE-expressing cells, we determined that RAGE is a native C1q globular domain receptor. Direct C1q-sRAGE interaction was demonstrated with surface plasmon resonance (SPR), with minimum K d 5.6μM, and stronger binding affinity seen in ELISA-like experiments involving multivalent binding. Pull-down experiments suggested formation of a receptor complex of RAGE and Mac-1 to further enhance affinity for C1q. C1q induced U937 cell adhesion and phagocytosis was inhibited by antibodies to RAGE or Mac-1. These data link C1q and RAGE to the recruitment of leukocytes and phagocytosis of C1q-coated material.
机译:RAGE是细胞表面分子免疫球蛋白超家族的多配体受体,与先天和适应性免疫有关。补体成分C1q在补体激活和抗体非依赖性调理中起作用。使用可溶性形式的RAGE(sRAGE)和表达RAGE的细胞,我们确定RAGE是天然的C1q球状结构域受体。直接C1q-sRAGE相互作用具有表面等离振子共振(SPR),最小K d5.6μM,并且在涉及多价结合的ELISA样实验中可见到更强的结合亲和力。下拉实验表明,RAGE和Mac-1受体复合物的形成进一步增强了对C1q的亲和力。 C1q诱导的U937细胞粘附和吞噬作用被RAGE或Mac-1抗体抑制。这些数据将C1q和RAGE与白细胞募集和C1q涂层材料的吞噬作用联系起来。

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